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EFFECT OF ROTATIONAL SPEED OF $PROTAPER^{TM}$ ROTARY FILE ON THE CHANCE OF ROOT CANAL CONFIGURATION

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Abstract

º» ¿¬±¸´Â ¿£Áø ±¸µ¿Çü Ni-Ti ÆÄÀÏÀÎ $ProTaper^{TM}$¸¦ ÀÌ¿ëÇÏ¿© Á¼°í ¸¸°îµÈ ±Ù°ü ÇüŸ¦ °¡Áö´Â ·¹Áø ¸ðÇü»ó¿¡¼­ ȸÀü ¼Óµµ¸¦ º¯È­½ÃÄ×À» ¶§ ±Ù°ü ÇüÅ º¯È­¿¡ ´ëÇØ ºñ±³ ºÐ¼®Çϱâ À§ÇØ ½ÃÇàµÇ¾ú´Ù. 16 mmÀÇ ÀÛ¾÷Àå ±æÀ̸¦ °®´Â 40°³ÀÇ ±â¼ºÇ° ·¹Áø ºí·ÏÀ» ¿£Áø ±¸µ¿Çü Ni-TiÆÄÀÏÀÎ $ProTaper^{TM}$¸¦ »ç¿ëÇÏ¿© ȸÀü ¼Óµµ¸¦ Á¦¿ÜÇÏ°í Á¦Á¶ÀÚÀÇ Áö½Ã¿¡ µû¶ó Å©¶ó¿î´Ù¿î¹ýÀ¸·Î ±Ù°ü ¼ºÇüÇÏ¿´´Ù. ¿¬±¸¿¡ »ç¿ëµÈ ȸÀü ¼Óµµ´Â 250 rpm, 300 rpm, 350 rpm, 400 rpmÀ̾úÀ¸¸ç, ±Ù÷ºÎ ¼ºÇüÀº #25 ÆÄÀÏ Å©±âÀÎ F2·Î ½ÃÇàÇÏ¿´´Ù. ±Ù°ü ¼ºÇü Àü ÈÄ À̹ÌÁö¸¦ ½ºÄ³³Ê¸¦ ÀÌ¿ëÇÏ¿© ¾ò¾ú°í, Photoshop 7.0 ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© ÁßøÇÏ¿´´Ù. À̹ÌÁö ºÐ¼® ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© Ä¡±Ù´Ü ÂÊ¿¡¼­ºÎÅÍ 1, 2, 3, 4, 5, 6, 7 ¹× 8 mmºÎÀ§ÀÇ ³» ¿ÜÃø Æø°æ º¯È­¿Í ÃÑÆø°æ ¹× ±Ù°üÀÇ Áß½ÉÃà¿¡ ´ëÇÑ ±Ù°ü º¯À§¸¦ ÃøÁ¤ÇÏ¿´´Ù. °¢ ºÎÀ§¿¡¼­ ³» ¿ÜÃø Æø°æ°ú ÃÑÆø°æ ¹× ±Ù°üÀÇ Áß½ÉÃà¿¡ ´ëÇÑ ±Ù°ü º¯À§ÀÇ À¯ÀǼº °ËÁ¤À» À§ÇØ one-way ANOVAºÐ¼®À» ½ÃÇàÇÏ¿´À¸¸ç, °¢ ±â±¸°£ÀÇ À¯ÀǼº °ËÁ¤Àº Scheffe¡¯¡¯s test·Î »çÈÄ ºÐ¼®ÇÏ¿´´Ù. ¶ÇÇÑ ±Ù°ü ¼ºÇü ½Ã°£ ±â±¸ÀÇ º¯Çü°ú ÆÄÀý ¿©ºÎ¸¦ Æò°¡ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. º» ½ÇÇè¿¡ ÀÌ¿ëµÈ ȸÀü¼Óµµ·Î ±Ù°ü¼ºÇü½Ã ȸÀü ¼Óµµ¿Í °ü°è¾øÀÌ Ä¡±Ù÷¿¡¼­ 2 mmºÎÀ§±îÁö´Â ¸¸°îÀÇ ¿ÜÃøÀ¸·Î º¯À§µÇ°í, $3{\sim}6mm$ºÎÀ§¿¡¼­´Â ¸¸°îÀÇ ³»ÃøÀ¸·Î º¯À§ µÇ¾ú´Ù. ±Ù÷¿¡¼­ 5 mm¿Í 6 mm ºÎÀ§¸¦ Á¦¿ÜÇÏ°í ±Ù°üÀÇ Áß½ÉÃà¿¡ ´ëÇÑ ±Ù°ü º¯À§´Â Åë°èÀûÀ¸·Î À¯ÀǼºÀÌ ¾ø¾ú´Ù. 2. 350 rpm, 400 rpmÀÇ °æ¿ì 250 rpm, 300 rpm¿¡ ºñÇØ ´õ ªÀº ½Ã°£ÀÌ °É·È´Ù. (p<0.01). ÀÌ»óÀÇ °á°ú´Â ¿£Áø ±¸µ¿Çü Ni-TiÆÄÀÏÀÎ $ProTaper^{TM}$¸¦ »ç¿ëÇÏ¿© $250{\sim}400rpm$ÀÇ È¸Àü¼Óµµ·Î ±Ù°ü ¼ºÇü½Ã ±Ù°ü ÇüŸ¦ Àß À¯ÁöÇϸç, ºü¸¥ ȸÀü ¼Óµµ·Î ¼ºÇü½Ã ÀÛ¾÷ ½Ã°£µµ ÁÙÀÏ ¼ö ÀÖÁö¸¸, ¼Óµµ°¡ »¡¶óÁö¸é ÆÄÀÏÀÇ ÆÄÀýÀÌ ÀϾ ¼ö ÀÖÀ¸¹Ç·Î ÁÖÀÇÇØ¾ß ÇÔÀ» ½Ã»çÇÑ´Ù.

This study was conducted to evaluate canal configuration after shaping by $ProTaper^{TM}$ with various rotational speed in J-shaped simulated resin canals. Forty simulated root canals were divided into 4 groups, and instrumented using by $ProTaper^{TM}$ at the rotational speed of 250, 300, 350 and 400 rpm. Pre-instrumented and post-instrumented images were taken by a scanner and those were superimposed. Outer canal width, inner canal width, total canal width, and amount of transportation from original axis were measured at 1, 2, 3, 4, 5, 6, 7 and 8 mm from apex. Instrumentation time, instrument deformation and fracture were recorded. Data were analyzed by means of one-way ANOVA followed by Scheffe¡¯¡¯s test. The results were as follows 1. Regardless of rotational speed, at the $1{\sim}2mm$ from the apex, axis of canal was transported to outer side of a curvature, and at 3~6 mm from the apex, to inner side of a curvature. Amounts of transportation from original axis were not sienifcantly different among experimental groups except at 5 and 6 mm from the apex. 2. Instrumentation time of 350 and 400 rpm was significantly less than that of 250 and 300 rpm (p<0.01). In conclusion the rotational speed of $ProTaper^{TM}$ files in the range of $250{\sim}400rpm$ does not affect the change of canal configuration, and high rotational speed reduces the instrumentation time. However appearance of separation and distortion of Ni-Ti rotary files can occur in high rotational speed.

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ȸÀü¼Óµµ;±Ù°üÇüÅÂ;À̹ÌÁöºÐ¼®;Rotational speed;Canal configuration;Image analysis

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